
Hydraulic Fan System Controller – HFS-3-12v
13
12VDC (10 to14VDC) Supply I/P
PWM 0V (GND) I/P from ECU
Block Diagram:
Wiring Information:
PWM
F.E.T.
output
stage
I Max ( 20 Turn potentiometer )
‘Dither’ ( PWM )
frequency adjust
I Min adjust
+V Supply
GND (0v)
PWM +
from ECU
Internal
PSU
Current
Feedback
PWM ‘ f ’
generator
Output to
valve coil
interface
PWM –
from ECU
PWM to
Voltage
Ramp
Generator
Output invert link
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